Revert "[automated] Updating /docs due to commit 60b1951" and "Generalize scene description for automated testing (#9627)"

This reverts commit e2dd47bf42.
This reverts commit 60b1951f90.

renderdiff test breakage

test/renderdiff/tests/presubmit.json

@@ -7,7 +7,7 @@
             "name": "base",
             "models": ["Box", "BoxTextured", "FlightHelmet", "lucy"],
             "rendering": {
-                "camera.focalLength": 35.0,
+                "viewer.cameraFocalLength": 35.0,
                 "view.postProcessingEnabled": true,
                 "view.dithering": "NONE"
             },
@@ -56,7 +56,7 @@
             "description": "transmission",
             "apply_presets": ["base", "transmission_models"],
             "rendering": {
-                "camera.focalLength": 52.0
+                "viewer.cameraFocalLength": 52.0
             }
         },
         {

test/renderdiff/tests/sample.json

@@ -12,7 +12,7 @@
             "models": ["lucy", "DamagedHelmet"],      // [optional] Base name for the gltf file used in the test.  For
                                                       //     example, source files are lucy.glb and DamagedHelmet.gltf
             "rendering": {                            // [required] Rendering settings used in the test. The json format
-                "camera.focusDistance": 0,            //     is taken from AutomationSpec in libs/viewer
+                "viewer.cameraFocusDistance": 0,      //     is taken from AutomationSpec in libs/viewer
                 "view.postProcessingEnabled": true
             }
         }